Motions of Earth
Imaginary line through the center of a planet or other body around which that body spins
What is an axis?
Scientists use this property of stars to determine the temperature of a star.
What is color?
A massive star that has collapsed and whose gravity is so powerful that it pull in everything, even light.
What is a black hole?
Huge, arching columns, threads, or "clouds" of gas between the magnetic field of sunspots on the Sun.
What is a prominence?
An explanation that states all matter and energy exploded from one point and has been expanding apart ever since.
What is the Big Bang Theory?
One complete _____ takes 365.25 days for Earth. (NOT YEAR)
What is revolution?
The brightness of a star as it's seen from Earth.
What is apparent magnitude?
Stars that fall within a long, narrow, diagonal band across the H-R diagram.
What are main sequence stars?
The visible surface of the sun.
What is the photosphere?
The day the Sun shines directly on the equator and creates 12 hours of daylight and 12 hours of darkness all around the world.
What is equinox?
This spinning causes daylight and darkness every 24 hours.
What is rotation?
These are the two most common elements that compose the sun
What are hydrogen and helium?
Very small, hot stars.
What are white dwarfs?
Temporary regions in the Sun's surface that are cool.
What are sunspots?
This is the longest day of the year in the Southern Hemishere.
What is the winter solstice (around DeCember 21)?
The term for when Earth is farthest from the Sun.
What is aphelion?
The term for actual brightness determined by the size and temperature of a star.
What is absolute magnitude?
The joining of two nuclei of hydrogen atoms to form helium with extreme amounts of energy being released.
What is nuclear fusion?
The layer of the Sun next to the corona, often called the "color sphere" becuase it gives of a weak red glow.
What is the chromosphere?
This is the age of the universe, rounded off to the nearest billion years
What is 14 (really 13.8) billion years?
This is the reason for the seasons.
What is the tilt of the Earth (23.5o).
The unit used to measure the distance between stars.
What is a light year?
These stars are even larger than red giants, and typically cooler.
What are supergiants?
These electrically charged particles that can disrupt radio signals erupt around sunspots.
What are solar flares?
This color given off by the hottest stars.
What is blue?